1. Clinical Epidemiology and Medical Statistics Unit Department of Medical Surgical, Experimental Sciences University of Sassari Sassari Italy
2. Management Engineering Tourbillon Tech srl Padova Italy
3. Respiratory Unit Department of Health Sciences ASST Santi Paolo e Carlo Università degli Studi di Milano Milan Italy
4. Department of Pathophysiology and Transplantation Università degli Studi di Milano Milan Italy
5. Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico Milan Italy
6. Allergy & Asthma Clinic Humanitas University & Research Hospital IRCCS Milan Italy
7. Respiratory Department Hospital Universitario de la Princesa Madrid Spain
8. Centro de Investigación en Red de Enfermedades Respiratorias (CIBERES) Instituto de Salud Carlos III (ISCIII) Madrid Spain
9. Departments of Pneumology Intensive Care Medicine, Center for Internal Medicine Universitätsmedizin Rostock Rostock Germany